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Analysis of linear electrode array EMG for assessment of hemiparetic biceps brachii muscles

This study presents a frequency analysis of surface electromyogram (EMG) signals acquired by a linear electrode array from the biceps brachii muscles bilaterally in 14 hemiparetic stroke subjects. For different levels of isometric contraction ranging from 10 to 80% of the maximum voluntary contracti...

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Autores principales: Yao, Bo, Zhang, Xu, Li, Sheng, Li, Xiaoyan, Chen, Xiang, Klein, Cliff S., Zhou, Ping
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4615822/
https://www.ncbi.nlm.nih.gov/pubmed/26557068
http://dx.doi.org/10.3389/fnhum.2015.00569
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author Yao, Bo
Zhang, Xu
Li, Sheng
Li, Xiaoyan
Chen, Xiang
Klein, Cliff S.
Zhou, Ping
author_facet Yao, Bo
Zhang, Xu
Li, Sheng
Li, Xiaoyan
Chen, Xiang
Klein, Cliff S.
Zhou, Ping
author_sort Yao, Bo
collection PubMed
description This study presents a frequency analysis of surface electromyogram (EMG) signals acquired by a linear electrode array from the biceps brachii muscles bilaterally in 14 hemiparetic stroke subjects. For different levels of isometric contraction ranging from 10 to 80% of the maximum voluntary contraction (MVC), the power spectra of 19 bipolar surface EMG channels arranged proximally to distally along the muscle fibers were examined in both paretic and contralateral muscles. It was found that across all stroke subjects, the median frequency (MF) and the mean power frequency (MPF), averaged from different surface EMG channels, were significantly smaller in the paretic muscle compared to the contralateral muscle at each of the matched percent MVC contractions. The muscle fiber conduction velocity (MFCV) was significantly slower in the paretic muscle than in the contralateral muscle. No significant correlation between the averaged MF, MPF, or MFCV vs. torque was found in both paretic and contralateral muscles. However, there was a significant positive correlation between the global MFCV and MF. Examination of individual EMG channels showed that electrodes closest to the estimated muscle innervation zones produced surface EMG signals with significantly higher MF and MPF than more proximal or distal locations in both paretic and contralateral sides. These findings suggest complex central and peripheral neuromuscular alterations (such as selective loss of large motor units, disordered control of motor units, increased motor unit synchronization, and atrophy of muscle fibers, etc.) which can collectively influence the surface EMG signals. The frequency difference with regard to the innervation zone also confirms the relevance of electrode position in surface EMG analysis.
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spelling pubmed-46158222015-11-09 Analysis of linear electrode array EMG for assessment of hemiparetic biceps brachii muscles Yao, Bo Zhang, Xu Li, Sheng Li, Xiaoyan Chen, Xiang Klein, Cliff S. Zhou, Ping Front Hum Neurosci Neuroscience This study presents a frequency analysis of surface electromyogram (EMG) signals acquired by a linear electrode array from the biceps brachii muscles bilaterally in 14 hemiparetic stroke subjects. For different levels of isometric contraction ranging from 10 to 80% of the maximum voluntary contraction (MVC), the power spectra of 19 bipolar surface EMG channels arranged proximally to distally along the muscle fibers were examined in both paretic and contralateral muscles. It was found that across all stroke subjects, the median frequency (MF) and the mean power frequency (MPF), averaged from different surface EMG channels, were significantly smaller in the paretic muscle compared to the contralateral muscle at each of the matched percent MVC contractions. The muscle fiber conduction velocity (MFCV) was significantly slower in the paretic muscle than in the contralateral muscle. No significant correlation between the averaged MF, MPF, or MFCV vs. torque was found in both paretic and contralateral muscles. However, there was a significant positive correlation between the global MFCV and MF. Examination of individual EMG channels showed that electrodes closest to the estimated muscle innervation zones produced surface EMG signals with significantly higher MF and MPF than more proximal or distal locations in both paretic and contralateral sides. These findings suggest complex central and peripheral neuromuscular alterations (such as selective loss of large motor units, disordered control of motor units, increased motor unit synchronization, and atrophy of muscle fibers, etc.) which can collectively influence the surface EMG signals. The frequency difference with regard to the innervation zone also confirms the relevance of electrode position in surface EMG analysis. Frontiers Media S.A. 2015-10-23 /pmc/articles/PMC4615822/ /pubmed/26557068 http://dx.doi.org/10.3389/fnhum.2015.00569 Text en Copyright © 2015 Yao, Zhang, Li, Li, Chen, Klein and Zhou. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Neuroscience
Yao, Bo
Zhang, Xu
Li, Sheng
Li, Xiaoyan
Chen, Xiang
Klein, Cliff S.
Zhou, Ping
Analysis of linear electrode array EMG for assessment of hemiparetic biceps brachii muscles
title Analysis of linear electrode array EMG for assessment of hemiparetic biceps brachii muscles
title_full Analysis of linear electrode array EMG for assessment of hemiparetic biceps brachii muscles
title_fullStr Analysis of linear electrode array EMG for assessment of hemiparetic biceps brachii muscles
title_full_unstemmed Analysis of linear electrode array EMG for assessment of hemiparetic biceps brachii muscles
title_short Analysis of linear electrode array EMG for assessment of hemiparetic biceps brachii muscles
title_sort analysis of linear electrode array emg for assessment of hemiparetic biceps brachii muscles
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4615822/
https://www.ncbi.nlm.nih.gov/pubmed/26557068
http://dx.doi.org/10.3389/fnhum.2015.00569
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